UC2844B

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Current Mode PWM

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  • The UC284xB family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off-state.

    Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC2842B and UC2844B have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC2843B and UC2845B are 8.5V and 7.9V. The UC2842B and UC2843B can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC2844B and UC2845B by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.

    Key Features

    • LOW START-UP AND OPERATING CURRENT
    • UNDERVOLTAGE LOCKOUT WITH HYSTERESIS
    • INTERNALLY TRIMMED REFERENCE WITH UNDERVOLTAGE LOCKOUT
    • CURRENT LIMITING
    • TRIMMED OSCILLATOR FOR PRECISE FREQUENCY CONTROL
    • CURRENT MODE OPERATION TO 500kHz
    • OSCILLATOR FREQUENCY GUARANTEED AT 250kHz
    • LATCHING PWM FOR CYCLE-BY-CYCLE
    • HIGH CURRENT TOTEM POLE OUTPUT
    • AUTOMATIC FEED FORWARD COMPENSATION

Circuit Diagram

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UC2844BD1 SO-8 Tube
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UC2844BD1013TR SO-8 Tape And Reel
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UC2844BN DIP-8 Tube
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UC2844BD1

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SO-8

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DIGIKEY WORLDWIDE 1488 1 Order Now
COMPEL EUROPE 2078 1 Order Now
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1

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2078

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1005

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3754

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1000

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EAR99

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UC2844BD1013TR

Package

SO-8

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Tape And Reel

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0.3312*

Distributor availability ofUC2844BD1013TR

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 346 1 Order Now
FUTURE WORLDWIDE 2500 2500 Order Now
ARROW EUROPE 17500 0 Order Now
Newark Element14 AMERICA 475 0 Order Now
MOUSER WORLDWIDE 4629 1 Order Now
Farnell Element14 EUROPE 2211 1 Order Now

Distributor reported inventory date: 2020-01-16

Distributor Name

DIGIKEY

Stock

346

Min.Order

1

Region

WORLDWIDE Order Now

FUTURE

Stock

2500

Min.Order

2500

Region

WORLDWIDE Order Now

ARROW

Stock

17500

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

475

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

4629

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2211

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1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-01-16

Marketing Status

Active

Unit Price (US$)

0.3312

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MOROCCO

UC2844BN

Package

DIP-8

Packing Type

Tube

Unit Price (US$)

0.3312*

Distributor availability ofUC2844BN

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1890 1 Order Now
RS COMPONENTS EUROPE 190 10 Order Now
AVNET AMERICA 1000 0 Order Now
ARROW EUROPE 18753 0 Order Now
Newark Element14 AMERICA 277 0 Order Now
ARROW AMERICA 1896 2000 Order Now
MOUSER WORLDWIDE 2161 1 Order Now
Farnell Element14 EUROPE 396 1 Order Now
RUTRONIK EUROPE 1850 50 Order Now

Distributor reported inventory date: 2020-01-16

Distributor Name

DIGIKEY

Stock

1890

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

190

Min.Order

10

Region

EUROPE Order Now

AVNET

Stock

1000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

18753

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

277

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

1896

Min.Order

2000

Region

AMERICA Order Now

MOUSER

Stock

2161

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

396

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

1850

Min.Order

50

Region

EUROPE Order Now

Distributor reported inventory date: 2020-01-16

Marketing Status

Active

Unit Price (US$)

0.3312

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

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Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
UC2844BD1
Active
SO-8 Industrial Ecopack2
UC2844BD1013TR
Active
SO-8 Industrial Ecopack2
UC2844BN
Active
DIP-8 Industrial Ecopack2

UC2844BD1

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

UC2844BD1013TR

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

UC2844BN

Package:

DIP-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DIP-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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